Paper Information

Journal:   INTERNATIONAL JOURNAL OF ENGINEERING   DECEMBER 2004 , Volume 17 , Number 4 (TRANSACTIONS B: APPLICATIONS); Page(s) 395 To 404.
 
Paper: 

AN UPPER BOUND APPROACH FOR ANALYSIS OF HYDROFORMING OF SHEET METALS

 
 
Author(s):  ASSEMPOUR A.*, BAGHERZADEH M., EMAMI MOHAMMAD REZA
 
* CENTER OF EXCELLENCE IN DESIGN, ROBOTICS AND AUTOMATION, DEPARTMENT OF MECHANICAL ENGINEERING, SHARIF UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN,
 
Abstract: 

Considering a kinematical velocity admissible field, the upper bound method has been used for predicting the amount of pressure in hydroforming of sheet metals. The effects of work hardening, friction and blank size have been considered in pressure prediction. Also the effect of sheet thickness variation has been considered in the present work formulations. The relation between pressure and punch stroke has been obtained and optimized by changing the selective parameters in the velocity components. The results for cylindrical and hemispheric parts have been obtained and compared with the published experimental results. The effects of work hardening, friction and blank size on hydroforming pressure have been examined on an elliptical part. Good agreement was found between the experimental and numerical results.

 
Keyword(s): HYDROFORMING, SHEET METALS, UPPER BOUND, 3D STRAIN, WORK HARDENING, THICKNESS VARIATION
 
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